| 摘要: |
| 用人工酸化的东湖水为培养液对双棘臂尾轮虫进行室内单个体培养研究.结果表明,与用未酸化的东湖水培养结果相比,轮虫非混交雌体的平均产卵量在 pH6. 5、5 5和 4. 5时增加,而在 pH3.5时减少.在 pH5.5和 3.5时轮虫种群的内禀增长率增大,种群中无混交雌体出现;而在pH6.5和4.5时内禀增长率减小,混交雌体百分率增大.在本实验pH范围内,双棘臂尾轮虫具有耐酸性. |
| 关键词: 水质酸化 双棘臂尾轮虫 种群动态 |
| DOI：10.18307/1999.0212 |
| 分类号: |
| 基金项目:中国科学院“九五”重大项目资助 |
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| Effects of Water Acidification on the Dynamics of Population Growth of Brachionus bidentata |
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XI Yi-long, HUANG Xiang-fei
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Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072
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| Abstract: |
| A study was carried to investigate the effects of precipitation-acidified water of Donghu Lake on the survival and reproduction of Brachionus bidentata under the condition of individual cul-ture. The experiment was conducted at 28℃ in a photoperial (L:D = 18:6) with light intensity about 500 lx. rhe rotifers were fed with ChLorella pyronoidosa at a density of 6. 0 X 106cells · mL-1，and the mediums were exchanged once twelve hours. The results show that when the roti-fers were cultured in unacidified water (pH8.4) of Donghu lake, the percentage of mictic females and the mean number of amictic eggs were 8.33% and 13.909, respectively; The intrinsic rate of the population was 0.076015 h-1. Compared with the above results, when the media was acidi-fied to pH 6.5, 5.5 or 4.5，the numbers of amictic eggs increased to 18.778, 18.167 and 15.5 ind.，respectively; but decreased to 12.083 ind. at pH 3.5. The intrinsic rates of the populations at pH 5. 5 and 3. 5 increased to 0.08901 and 0.079684 h-1, and no mictic females appeared, re-spectively. At pH 6.5 and 4.5, the intrinsic rates decreased to 0.069258 and 0.07354 h-1, bui the percentages of mictic females increased to 25% and 16.67%, respectively. Between pH 6.5 and pH 3.5，Brachionus bidentata was acid tolerant. |
| Key words: Water acidification Brachionus bidentata population dynamics |
